1 /* $OpenBSD: db_variables.c,v 1.21 2020/10/15 03:14:00 deraadt Exp $ */ 2 /* $NetBSD: db_variables.c,v 1.8 1996/02/05 01:57:19 christos Exp $ */ 3 4 /* 5 * Mach Operating System 6 * Copyright (c) 1993,1992,1991,1990 Carnegie Mellon University 7 * All Rights Reserved. 8 * 9 * Permission to use, copy, modify and distribute this software and its 10 * documentation is hereby granted, provided that both the copyright 11 * notice and this permission notice appear in all copies of the 12 * software, derivative works or modified versions, and any portions 13 * thereof, and that both notices appear in supporting documentation. 14 * 15 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 16 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 17 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 18 * 19 * Carnegie Mellon requests users of this software to return to 20 * 21 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 22 * School of Computer Science 23 * Carnegie Mellon University 24 * Pittsburgh PA 15213-3890 25 * 26 * any improvements or extensions that they make and grant Carnegie Mellon 27 * the rights to redistribute these changes. 28 */ 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 33 #include <machine/db_machdep.h> 34 35 #include <ddb/db_lex.h> 36 #include <ddb/db_variables.h> 37 #include <ddb/db_command.h> 38 #include <ddb/db_sym.h> 39 #include <ddb/db_extern.h> 40 #include <ddb/db_var.h> 41 42 struct db_variable db_vars[] = { 43 { "radix", (long *)&db_radix, db_var_rw_int }, 44 { "maxoff", (long *)&db_maxoff, db_var_rw_int }, 45 { "maxwidth", (long *)&db_max_width, db_var_rw_int }, 46 { "tabstops", (long *)&db_tab_stop_width, db_var_rw_int }, 47 { "lines", (long *)&db_max_line, db_var_rw_int }, 48 { "log", (long *)&db_log, db_var_rw_int } 49 }; 50 struct db_variable *db_evars = db_vars + nitems(db_vars); 51 52 int 53 db_find_variable(struct db_variable **varp) 54 { 55 int t; 56 struct db_variable *vp; 57 58 t = db_read_token(); 59 if (t == tIDENT) { 60 for (vp = db_vars; vp < db_evars; vp++) { 61 if (!strcmp(db_tok_string, vp->name)) { 62 *varp = vp; 63 return (1); 64 } 65 } 66 for (vp = db_regs; vp < db_eregs; vp++) { 67 if (!strcmp(db_tok_string, vp->name)) { 68 *varp = vp; 69 return (1); 70 } 71 } 72 } 73 db_error("Unknown variable\n"); 74 /*NOTREACHED*/ 75 return 0; 76 } 77 78 int 79 db_get_variable(db_expr_t *valuep) 80 { 81 struct db_variable *vp; 82 83 if (!db_find_variable(&vp)) 84 return (0); 85 86 db_read_variable(vp, valuep); 87 88 return (1); 89 } 90 91 int 92 db_set_variable(db_expr_t value) 93 { 94 struct db_variable *vp; 95 96 if (!db_find_variable(&vp)) 97 return (0); 98 99 db_write_variable(vp, &value); 100 101 return (1); 102 } 103 104 105 void 106 db_read_variable(struct db_variable *vp, db_expr_t *valuep) 107 { 108 int (*func)(struct db_variable *, db_expr_t *, int) = vp->fcn; 109 110 if (func == FCN_NULL) 111 *valuep = *(vp->valuep); 112 else 113 (*func)(vp, valuep, DB_VAR_GET); 114 } 115 116 void 117 db_write_variable(struct db_variable *vp, db_expr_t *valuep) 118 { 119 int (*func)(struct db_variable *, db_expr_t *, int) = vp->fcn; 120 121 if (func == FCN_NULL) 122 *(vp->valuep) = *valuep; 123 else 124 (*func)(vp, valuep, DB_VAR_SET); 125 } 126 127 /*ARGSUSED*/ 128 void 129 db_set_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif) 130 { 131 db_expr_t value; 132 struct db_variable *vp; 133 int t; 134 135 t = db_read_token(); 136 if (t != tDOLLAR) { 137 db_error("Unknown variable\n"); 138 /*NOTREACHED*/ 139 } 140 if (!db_find_variable(&vp)) { 141 db_error("Unknown variable\n"); 142 /*NOTREACHED*/ 143 } 144 145 t = db_read_token(); 146 if (t != tEQ) 147 db_unread_token(t); 148 149 if (!db_expression(&value)) { 150 db_error("No value\n"); 151 /*NOTREACHED*/ 152 } 153 if (db_read_token() != tEOL) { 154 db_error("?\n"); 155 /*NOTREACHED*/ 156 } 157 158 db_write_variable(vp, &value); 159 } 160 161 int 162 db_var_rw_int(struct db_variable *var, db_expr_t *expr, int mode) 163 { 164 165 if (mode == DB_VAR_SET) 166 *(int *)var->valuep = *expr; 167 else 168 *expr = *(int *)var->valuep; 169 return (0); 170 } 171